c++ builder XE4, 10.2 Tokyo > TeeChart > シリーズから点を除く > Series1->Delete(0);

動作環境

C++ builder XE4
    TeeChart Lite v2013.08.130414
RAD Studio 10.2 Tokyo Update 2 (追記 2018/01/10)
    TeeChart v2016.17.160129 32bit VCL

TeeChartで余分となった点をシリーズから取り除く方法。

参考
https://www.steema.com/files/public/teechart/java/v1/docs/Tutorials/tutorial6.htm

Unit1.cpp

//---------------------------------------------------------------------------

# include <vcl.h>
# pragma hdrstop

# include <DateUtils.hpp>
# include "Unit1.h"
//---------------------------------------------------------------------------
# pragma package(smart_init)
# pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
	: TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormShow(TObject *Sender)
{
	Chart1->Series[0]->XValues->DateTime = true;
	Chart1->BottomAxis->DateTimeFormat = L"nn:ss";

	TDateTime dt;

	dt = Now();
	double dval;
	for (int idx=0; idx < 100; idx++) {
		dval = (double)random(60);

		Series1->AddXY(dt, dval, L"", clRed);
		dt = IncSecond(dt, 1);
	}
}
//---------------------------------------------------------------------------
void __fastcall TForm1::B_removeFirstClick(TObject *Sender)
{
	Series1->Delete(0);
}
//---------------------------------------------------------------------------

removeFirstボタンを押すたびに先頭のデータが取り除かれていく。

大量に取り除くにはDelete()を繰り返すことになるのだろうか。